Basic Chemical Information:

The important "ingredient" in Viagra is "Sildenafil Citrate"-

    chemically this is 1-[[2-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate.

Sildenafil citrtate is a white/off-white crystalline powder

Solubility - 3.5mg/mL

Molecular Mass 666.7 g

The drug is sold as blue diamond shape tablets of 25, 50 and 100 mg for oral administration.

Apart from sildenafil citrate viagra also contains numerous inactive components:

microcrystalline cellulose

anhydrous dibasic calcium phosphate

croscarmellose sodium

magnesium stearate

hydroxypropyl methylcellulose

titanium dioxide



FD & C Blue #2aluminum lake


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Chemical Information was obtained from Pfizer.  Further details are available at